package com.hjx.movie.core.util;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
 * <p>Title:</p>
 * <p>Description:</p>
 *
 * @author hjx
 * @date 2021/1/15 - 19:54
 */
public class CombineBeansUtil {

    /**
     ** 该方法是用于相同对象不同属性值的合并<br>
     ** 如果两个相同对象中同一属性都有值，那么sourceBean中的值会覆盖tagetBean重点的值<br>
     ** 如果sourceBean有值，targetBean没有，则采用sourceBean的值<br>
     ** 如果sourceBean没有值，targetBean有，则保留targetBean的值
     *
     * @param sourceBean    被提取的对象bean
     * @param targetBean    用于合并的对象bean
     * @return targetBean,合并后的对象
     */
    public static <T> T combineBean(T sourceBean, T targetBean){
        Class<? extends Object> sourceBeanClass = sourceBean.getClass();
        Class<? extends Object> targetBeanClass = targetBean.getClass();

        Field[] sourceFields = sourceBeanClass.getDeclaredFields();
        Field[] targetFields = targetBeanClass.getDeclaredFields();
        for(int i=0; i<sourceFields.length; i++){
            Field sourceField = sourceFields[i];
            if(Modifier.isStatic(sourceField.getModifiers())){
                continue;
            }
            Field targetField = targetFields[i];
            if(Modifier.isStatic(targetField.getModifiers())){
                continue;
            }
            sourceField.setAccessible(true);
            targetField.setAccessible(true);
            try {
                if( !(sourceField.get(sourceBean) == null) &&  !"serialVersionUID".equals(sourceField.getName())){
                    targetField.set(targetBean,sourceField.get(sourceBean));
                }
            } catch (IllegalArgumentException | IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return targetBean;
    }
}
